64681013670 has 128 divisors (see below), whose sum is σ = 202296600576. Its totient is φ = 12844210176.

The previous prime is 64681013669. The next prime is 64681013689. The reversal of 64681013670 is 7631018646.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 650434 + ... + 743253.

It is an arithmetic number, because the mean of its divisors is an integer number (1580442192).

Almost surely, 2^64681013670 is an apocalyptic number.

64681013670 is an abundant number, since it is smaller than the sum of its proper divisors (137615586906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64681013670 is a wasteful number, since it uses less digits than its factorization.

64681013670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393734.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 64681013670 in words is "sixty-four billion, six hundred eighty-one million, thirteen thousand, six hundred seventy".